Overedge sewing-machine.



PATENTED AUG. 15, 1905.,

1. KEYSER, OVEREDGE SEWING MAUI-ENE.

APPLICATION FILED 0613.8,1903.

3 SHEETS-FERRET l,

INVEHTOIJ WITNESSES 64 -w No. 797,2911. PATENTED AUG.15, 1905. G. KEYSER.

OVEEEDGE SEWING MACHINE.

APPLIOATION FILED 0OT.B,1903.

3 SHEBTS-3HBET 2.

PATENTED AUG. 15, 1905.

G. KBYSER.

OVEREDGE SEWING MACHINE.

APPLIUA'I'ION FILED OUT-8,1903- 3 SHEETS-SHEET 3.

WI THE 3855' maxim B GRAHAM cu, pnorc-umucuwuzns. \vnsnmcwlh n c TINTTFM Pft ifiiiit l'illi flFFfllilt lFl.

GEORGE KEYSEF', OF P111.lU/t'DFLPiiI] A, PEN NS) 11V AN 111, .iXSSlGNUR TO JOHN W. .HFlWVUlTlTll, OF :PLIIIJ/ ni)EiJ PiiillfK, lil lblltlftii'lJVAi llA.

UVEHIEWKKEIE SEWlMGwlWMfH-HNEE.

Specification of Letters Patent.

Patented Aug. 15, 1905.

Application filed October 8, 1908. Serial No. 176,204.

To In whom it may concern/.-

Be it known that 1, (:i-nonsn Kmt'snn, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Overedge Sewing-lilachines, of which the following is a specification.

This invention relates to overedge sewingmachines, and has for its object to provide a simple and eliicient construction of mechanism whereby the requisite compound movement may be imparted to the looper-hook, as will be hereinafter fully described and claimed.

in the drawings, Figure 1 is a side elevation, partly broken away, of a portion of a sewing-machine provided with my invention. Fig. 2 is a transverse vertical section thereof as on the line 2 2 of Fig. 1. Fig. 3 is an elevation of one of the oscillatory frames and adjuncts. Fig. 1 is a plan view of a portion of the looper-hook-actuating mechanism and adjuncts. Fig. 5 is a sectional detail as on the line 5 5 of Fig. 1. Fig. 6 is a similar detail as on the line 6 6 of Fig. 1. r

1 designates the base of the machine; 3, the main d riving-shaft, journaled in suitable bearings thereon, and i a post rising from the base and overhanging the driving-shaft.

7 7 are the usual intermittently-rotatable feed-cups, by and between which the edges of the fabric to be united are fed to and past the stitch-forming mechanism, and 8 is the needle carried by the bar 9, which is connected by a link 10 to an oscillatory frame 11, which is pivoted to a fixed shaft 152, arranged below the shaft 3. The frame 11 is provided with a bifurcated portion 13, in which is arranged an eccentric 14, fixed to the main shaft 3, whereby when the latter is operated the needle 8 is rcciprocated across the bite of the feed-cups 7 to penetrate the edges of the fabric in the usual manner during the formation of stitches.

Thus far the machine is of well-known construction and needs no detailed description herein.

15 is the looper-hook, which is arranged above the needle 8, as usual, and is operated in respect to the reciprocations of the needle to act upon the thread in the usual manner during the formation of stitches to unite the edges of the fabric. During this operation the free end of the looper-hook 15 given a compound up-and-doum, forward-amlback, and lateral movement, and it travels through the path indicated by the arrows in Fig. 1. The mechanism to produce this compound movement in its preferred embodiment is of the following construction: The lOODGP-llOUk 15 projects downwardly and obliquely from the upper end of an inclined bar 16, which is arranged obliipiiely of the needle-bar 9. The lower end of the inclined bar 16 is screwthreaded and fitted to an ii'iternally-threaded extension member 17, forming, in cllect, a coiiitinuation of the bar, to the end that the bar 16 may be axially rotated independently of said member fora purpose hereinafter explained. The extension member 17 is pivotally connected, as at 18, to an oscillatory frame 19, which is pivotally mounted-on the fixed shaft 12. This frame 19 is provided with a bifurcated portion 29, in which is ar ranged an eccentric 21, fixed to the main shaft 3, whereby the frame 19 may be oscillated when the shaft 3 is rotated. The bar 16 extends through an arm 22, which is pivoted at its lower end to an extension on the post 41:, and the said bar is provided with a fixed ball 21, which is fitted to a socket 9.5 in the arm 22, thereby affording a universal pivot 26 of the bar 16 with the arm 22. hen the frame 19 is oscillated, the arm is rocked, and the forward and back and rising-andfalling movements of the pivotal connections 18 and 26 give a forward-andback and up-and -down movement to the looperhook 15. The bar 16 is provided with an arm 27, which is split and provided with a screw 28, by means of which the arm maybe secured to the said bar. The outer end of the arm 27 is made in the form of a ball .29, which is fitted to a socket in one end of a link 30. The other end of this link 30 is pivoted i to the upper end of an arm 31, which is pivoted, as at 32, to a projection 33 on the base 1. The arm 31 is provided with a biit'urcated portion 3a, in which is arranged an eccentric 35, fixed to the main shaft 3, whereby when the latter rotated the arm 31 will be oscillated. During the forward-and-back movement of the bar 16 the link 30 will swing on its pivot 36 and move the ball 29 toward and away from the arm 2-31, thereby rocking the bar 16 and producing a lateral movement of the lower end of the looper-hook 15 to and fro across the path traversed by the needle 8.

During this lateral movement of the lower end of the looper-hook 15 the eccentric 35 oscillates the arm 31 in a manner to shiftthe pivot 36 back and forth, which controls the to-andfro lateral movement, so that the lower end of the looper-hook is caused to move through the path indicated by the arrows in Fig. 1.

By the employment of the mechanism above described I have discovered that the looperhook 15 may be operated at a very high rate of speed and in a very efiicient manner to insure its engagement with the loop of thread presented by the needle 8 and its disengagement from said loop near the point of engagement of the needle with the edges of the fabric. By loosening the screw 28 and giving the bar 16 one or more complete'turns the screw-thread on the end of the bar, working in the internal thread in the extension member 17 will move the looper-hook 15 toward or from the pivot-point 18, and thereby adjust the position of the forward-and-back movement of the said looper-hook. By loosening the screw 28 and giving the bar 16 a slight turn and then tightening the said screw the position of the lateral movement of the lower end of looper-hook 15 may be adjusted, and by loosening the screw 28 and adjusting the arm 27 longitudinally of the bar 16 the timing of the lateral movement of the lower end of the looper-hook maybe regulated. These various adjustments enable me to adjust the mechanism so as to cure any defects that may appear in the path traversed by the lower end of the looper-hook 15, and thereby insure the accurate operation of the looper-hook.

I claim 1. In a sewing-machine, stitch-forming mechanism comprising a looper-hook and its bar, means for supporting and longitudinally reciprocating said bar, an arm having a fixed connection with and projecting from said bar, means for rotatively adjusting the connection between said arm and bar, a swinging support, a link pivoted to said support on an axis substantially at right angles to the length of said bar and having a ball-and-socket connection with one end of said arm, a second arm having a ball-and-socket connection with the bar, and a fixed support to which said second arm is pivoted.

2. In a sewing-machine, stitch -forming mechanism, the combination of a looper-hook and its bar, means for longitudinally reciprocating said bar, an arm adjustably clamped upon said bar, an oscillatory support adjacent said arm, a link having a ball-and-socket connection with one end of the arm and pivoted to the oscillatory support to cause the bar to be rocked upon its axis as it is reciprocated, an eccentric fitted to operate said support to change its position with respect to the bar and arm to thereby control the degree of rocking movement imparted to the bar by its reciprocation a second pivotally-mounted arm, and a ball-arid-socket connection between it and the bar.

3. In a sewing machine, stitch forming mechanism comprising the looper-hook and its bar, an extension member adjustably connected to said bar, means connected to said extension member for longitudinally reciprocating said bar, an arm projecting from and fixedly secured to said bar, a pivoted link connected to said arm, whereby the bar is axially rocked by the swinging movement of the pivotal link connection due to reciprocation of the bar, and means for adjusting said arm longitudinally along said bar.

in testimony whereof I aifix my signature in presence of two witnesses.

GEORGE KEYSER.

Witnesses:

ANDRnw V. GRoUrE, RALPH H. GAMBLE. 

